Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
This logic level indicator also indicates the presence of pulsating signals through a third LED. It...
Found in a 1968 Electronics World, this circuit uses components from the era. In this circuit, a...
The TAA300 integrated circuit is not common today. In fact, the circuit shown is from a Dutch...